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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad764c7c6251967373ac811e6ee49441b18de3b79670faf56512123d11b1f9ee' 
  AND token = 'isldCRmkr4fnr5xngriYbQ+a0sSVnGUkPhI67U2cYS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}